Estimating reflectance of a surface adjacent a handheld electronic device having a orientation sensor and a light sensor, including estimating a location of the handheld electronic device relative to the surface in dependence on information from the orientation sensor; measuring light from the surface with the light sensor; and estimating a reflectance of the surface in dependence on the estimated location and measured light.
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November 23, 2012
April 21, 2015
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